<template>
  <div class="xtx-carousel" @mouseleave="play" @mouseenter="stop">
    <ul class="carousel-body">
        <li class="carousel-item" :class="{ fade: active === index }" 
            v-for="(item, index) in slides" :key="item.id">
            <RouterLink :to="item.hrefUrl">
                <img :src="item.imgUrl" alt="">
            </RouterLink>
        </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="prev">
        <i class="iconfont icon-angle-left"></i>
    </a>
    <a href="javascript:;" class="carousel-btn next" @click="next">
        <i class="iconfont icon-angle-right"></i>
    </a>
    <div class="carousel-indicator">
      <span
        :class="{ active: active === index }"
        v-for="(item, index) in slides"
        :key="item.id"
        @mouseenter="active = index"
      ></span>
    </div>
  </div>
</template>

<script setup lang="ts" name="XtxCarousel">
import { BannerItem } from '@/types/data'
import { onMounted, onUnmounted, PropType, ref } from 'vue'
const props = defineProps({
    slides: {
        type: Array as PropType<BannerItem[]>,
        required: true
    },
    duration: {
        type: Number,
        default: 3000
    },
    autoPlay: {
        type: Boolean,
        default: false
    }
})
const active = ref(0)
const prev = () => {
    if(active.value <= 0) {
        active.value = props.slides.length - 1
    } else {
        active.value--
    }
}
const next = () => {
    if(active.value >= props.slides.length - 1) {
        active.value = 0
    } else {
        active.value++
    }
}
const play = () => {
    if(!props.autoPlay) return
    timer = window.setInterval(() => {
        next()
    }, props.duration)
}
const stop = () => {
    clearInterval(timer)
}
let timer = -1
onMounted(() => {
    play()
})
onUnmounted(() => {
    stop()
})
</script> 

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
